/Engine/Source/Runtime/Core/Public/UObject/ScriptDelegates.h
Checks whether a function delegate is already a member of this multi-cast delegate's invocation list
True if the delegate is already in the list.
bool Contains ( const [TScriptDelegate](API\Runtime\Core\UObject\TScriptDelegate)< [ThreadSafetyMode](API\Runtime\Core\UObject\TMulticastScriptDelegate\ThreadSafetyMode) > & InDelegate ) const